View memoize.rb
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class Memoizer < Module | |
def initialize(method_name) | |
define_method(method_name) do | |
super().tap do |value| | |
puts "memoizing" | |
define_singleton_method(method_name) { value } | |
end | |
end | |
end | |
end |
View test.rb
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# frozen_string_literal: true | |
require "bundler/inline" | |
gemfile(true) do | |
source "https://rubygems.org" | |
git_source(:github) { |repo| "https://github.com/#{repo}.git" } | |
gem "rails", github: "rails/rails" |
View speed_limit.rb
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class SpeedLimit | |
def initialize(enumerator) | |
@enumerator = enumerator.to_enum | |
end | |
def at(count, per:) | |
increment_seconds = case per | |
when :second then 1.0 / count.to_f | |
when :minute then 60.0 / count.to_f | |
when :hour then 3600.0 / count.to_f |
View tapper.rb
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def level_descriptions=(input) | |
write_attribute(:levels_description, input).tap do |_result| | |
flush_cache :levels_description | |
end | |
end | |
# same number of lines, one less method call, one less block, but pretty much the same as | |
# far as I'm concerned. | |
def level_descriptions=(input) | |
result = write_attribute(:levels_description, input) |
View memoize_example.rb
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module Memo | |
def memoize(method_name) | |
original_method = instance_method(method_name) | |
method_cache = Hash.new { |h, k| h[k] = {} } | |
define_method(method_name) do |*args, &block| | |
if method_cache[self].key?([args, block]) | |
method_cache[self][[args, block]] | |
else | |
method_cache[self][[args, block]] = original_method.bind(self).call(*args, &block) | |
end |
View instrumentor.rb
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module Instrumenter | |
class Instrumentation < Module | |
def initialize(method, label) | |
@method = method | |
@label = label | |
define_method(method) do |*args| | |
start_time = Time.now | |
super(*args).tap do | |
end_time = Time.now |
View urinal_game.rb
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bathroom.urinals.occupied.select { |urinal| urinal.adjacent.select(&:occupied?).any? } | |
Urinal = Struct.new(:is_occupied, :location) { def adjacent_urinals; location.adjacent_urinals; end } |
View delegates.rb
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require "delegate" | |
Foo = Class.new(SimpleDelegator) | |
Bar = Struct.new(:foo) | |
Foo.new(1) == Foo.new(1) # => true | |
Bar.new(1) == Bar.new(1) # => true | |
Foo.new(Bar.new(1)) == Foo.new(Bar.new(1)) # => false |
View bounded_hash.rb
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# frozen_string_literal: true | |
require "delegate" | |
require "set" | |
# Hash that can only hold a certain number of keys, keys expire on a LRU basis | |
class BoundedHash < DelegateClass(Hash) | |
NO_OP = proc {} |
View be_uniq.rb
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RSpec::Matchers.define :be_uniq do | |
match do |actual| | |
values_match? actual.uniq, actual | |
end | |
failure_message do |actual| | |
diff = actual.dup | |
actual.uniq.each { |value| diff.delete_at diff.index(value) } | |
diff = diff.uniq | |
"expected that #{actual.inspect} to be uniq, but found the following repeated elements: #{diff.inspect}" |
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